Writing instrument



FIG. 1 is a top perspective view of a writing instrument in accordance with our new design;

FIG. 2 is a top plan view thereof, the opposite side being a mirror image;

FIG. 3 is a front elevational view thereof, with the writing instrument rotated 90° with respect to the view in FIG. 2, and the opposite side being a mirror image;

FIG. 4 is an end elevational view thereof; taken from the left side of FIG. 3; and,

FIG. 5 is an opposite end elevational view thereof.

Throughout the drawings, the broken lines are shown for purposes of explanation only and form no part of the claimed design. 

The ornamental design for a writing instrument, as shown and described. 